Exhaust› Catalytic Converters

Supersprint

100CPSI HJS Motorsport Catalytic Converter Kit

$3,397.00

SKU: 044021

Special Order
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The Supersprint metallic catalytic converter kit is a 100CPSI HJS Motorsport unit designed for OEM headers with a weld-on connection.

This downpipe kit replaces restrictive factory US M3 catalytic converters with high-flowing units, offering substantial performance gains across the entire RPM range. It requires welding for installation and features O2 bungs and EGT threaded provisions for perfect fitment with Supersprint front exhaust sections or stock exhaust systems.
Show original supplier description
The Supersprint 044021 is a metallic catalytic converter kit featuring HJS Motorsport 100CPSI technology, designed to replace the restrictive factory US M3 catalytic converters. It offers substantial performance gains across the entire RPM range due to its high-flowing design, which approaches the flow rate of cat-deleting straight pipes. The kit includes threaded bungs for oxygen sensors and provisions for EGT sensors, ensuring seamless integration. Factory-spec flanges allow for a perfect fitment with both Supersprint front exhaust sections and the stock exhaust system. Installation of this kit requires welding. The design goes unnoticed during a visual inspection.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSupersprint
Part Number044021
CategoryExhaust
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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